Handling Files in Frappe

Hi people,

I’m currently facing an issue while attempting to add a watermark to a PDF file within a Frappe DocType. I’ve followed the guidance provided in the forum discussions and tried various solutions, but I’m still encountering an error.

Issue Description:

  • I have a Frappe DocType with a file field for uploading PDF files.
  • When attempting to add a watermark to the PDF file upon saving the document, I’m encountering the following error: "No such file or directory: ‘path to the uploaded file’ ".

Steps Taken:

  1. I’ve verified that the file paths are correct and the files actually exist.
  2. Adjusted the code based on community suggestions, including using Frappe’s File Manager.

Code Snippets:

def get_file_path(file_name):
    public_path = frappe.get_site_path('public')
    file_path = os.path.join(public_path, 'files', file_name)
    return file_path

def add_watermark(pdf_path, watermark_text, output_path):
        with open(pdf_path, 'rb') as pdf_file:
            pdf_reader = PyPDF2.PdfFileReader(pdf_file)
            pdf_writer = PyPDF2.PdfFileWriter()

            for page_num in range(pdf_reader.numPages):
                page = pdf_reader.getPage(page_num)

                watermark = fitz.TextWatermark()
                watermark.set_font(fitz.Font(fitz.FONT_HELVETICA), 36)
                watermark.set_pos((page.media_box[2] / 2, page.media_box[3] / 2))


            with open(output_path, 'wb') as output_file:
    except Exception as e:
        frappe.msgprint(f"Error adding watermark: {str(e)}")

class PDFTest(Document):
    def validate(self):
        # pdf_path = get_file_path(self.file)
        public_path = frappe.get_site_path('public')
        pdf_path = os.path.join(public_path, 'files', self.file)
        watermark_text = "some texts"
        output_path = get_file_path("watermark_added.pdf") 
        add_watermark(pdf_path, watermark_text, output_path)

I would appreciate any guidance or insights from the community regarding this issue. If anyone has successfully implemented watermarking in a Frappe DocType or can provide suggestions on handling file paths, it would be immensely helpful.

Thank you for your time and assistance!